A Bird’s Eye View on Sustainable Management Solutions for Non-degradable Plastic Wastes

Jeya, Gopal; Rajalakshmi, Sridharan; Krishnaswamy, Veena Gayathri; Priya, Ponmudi; Sakthivel, Pachagounder; Sivamurugan, Vajiravelu

doi:10.1007/978-3-030-72441-2_20

Cited by 8 publications

(6 citation statements)

References 160 publications

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“…PET plastics are very stable, chemically inactive and highly resistant to hydrolytic or microbial degradation, the key factors to which are their low chain mobility, high surface hydrophobicity and crystalline nature 8 . This crystallinity makes the degradation process more difficult for the microbes which degrade flexible amorphous solids with better ease.…”

Section: Pet Degrading Ability Of Ideonella Sakaiensismentioning

confidence: 99%

“…This necessitates the development of reactors capable of withstanding such extreme conditions. Further, acidic hydrolysis requires the use of harsh chemicals, such as, HNOƒ or concentrated H‚ SO" , that pose a high class of industrial hazard and risk associated with tightening environmental legislation 8 . Similar to hydrolysis, methanolysis is carried out at 180-280°C at 2-4MPa; maintaining such extreme conditions becomes less cost effective.…”

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confidence: 99%

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Recent Advancements and Mechanism of Plastics Biodegradation Promoted by Bacteria: A Key for Sustainable Remediation for Plastic Wastes

Kaur

Sharma

Shree

et al. 2023

Biosci., Biotech. Res. Asia

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Plastic has become an indispensable part of our lives and cutting down plastic consumption entirely is difficult to achieve. The recalcitrant and non-biodegradable nature of plastic leads to accumulation of tons of plastic in landfills and water bodies which further risks marine life and human life too causing serious health issues. In recent years, several microbial enzymes have been discovered that have the ability to degrade plastic. The present review highlights the recent discovery and properties of the plastic-eating bacteria, Ideonella sakaiensis, that has potential to be used for plastic degradation and recycling. The bacteria possess unique enzymes that allow it to utilise Polyethylene terephthalate (PET) plastic, thereby degrading it to relatively safer monomeric forms that can be further degraded and purified to manufacture recycled plastics. The review focuses on the mechanism of PET hydrolysis, recent advances in the field to escalate enzymatic efficiency and development of new bacterial and enzymatic strains through genetic engineering which can enhance its catalytic competence and make the process time and cost-effective. The plastic metabolising bacteria can thus be a potential and efficient bio-alternative to degrade plastic in a biological and sustainable manner thereby helping scale the otherwise insurmountable plastic pollution crisis.

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Section: Pet Degrading Ability Of Ideonella Sakaiensismentioning

confidence: 99%

mentioning

confidence: 99%

Recent Advancements and Mechanism of Plastics Biodegradation Promoted by Bacteria: A Key for Sustainable Remediation for Plastic Wastes

Kaur

Sharma

Shree

et al. 2023

Biosci., Biotech. Res. Asia

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“…Aminolysis is a method for PET chemolysis which has been relatively lesser explored when compared to other processes. There are only a few literature references regarding the chemolysis of the waste PET using different amines such as ethanolamine, triethanol amine, allylamine, and polyamines [17][18][19]. The catalytic systems reported for glycolysis and aminolysis recycling of PET wastes summarised in Table 1.…”

Section: Aminolytic Depolymerization Of Pet Wastementioning

confidence: 99%

Aminolytic Depolymerisation of Polyethylene Terephthalate Wastes using Sn doped ZnO Nanoparticles

Vinitha¹,

Preeyangha

Anbarasu³

et al. 2021

Preprint

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Poly(ethylene terephthalate) (PET) is one of the most consumed polymers because of its excellent thermal and mechanical properties. By increasing in PET production and since the disposal of PET waste has growing to be a major global environmental issue each year. Chemical recycling is a most successful method to achieve circular economy in the PET utilizing industries. Current research work aims to complete depolymerization of waste PET from soft drink bottles by the aminolysis method to produce bis (2-hydroxy ethylene) terephthalamide (BHETA) in the presence of Sn doped ZnO. To evaluate catalytic activity, pure and Sn2+ doped ZnO nanoparticles prepared using different Sn2+ molar ratios at 0.5, 1.0 and 2.0 mol% and calcined at 500 0C for 1h. The synthesized catalysts characterised using FT-IR, XRD, and UV-vis spectroscopy. The surface morphology and percentage doping obtained from SEM and SEM-EDS, respectively. We have observed a reduction in optical band gap and crystallite size of ZnO due to tin doping. Aminolytic depolymerization of PET waste using ethanolamine promoted by Sn doped ZnO effectively under conventional thermal method. Increase in the yield of the BHETA observed with respect to increasing doping percentage of Sn and 1-2 mol% Sn doped ZnO nanoparticles afforded over 90% of BHETA. Structure and purity of BHETA, depolymerised product characterized by FT-IR, 1HNMR, 13C NMR, and MS.

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“…Another method is called polymer recycling, which involves breaking down the waste PET into a mixture of short-chain PET and ethylene glycol and then using this mixture to produce new PET. The interest has been in developing and commercializing chemical recycling technologies for PET, as it has the potential to significantly reduce the environmental impact of PET waste [6,7]. However, the research and development required for improving the efficacy and scalability of these processes and to ensure that they are economically viable and environmentally sustainable in the long term [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…These are just a few examples of the companies and organizations that are working on developing and implementing chemical recycling technologies for PET. The field is rapidly evolving and many other companies and organizations are also making important contributions to this area of research [6,7].…”

Section: Introductionmentioning

confidence: 99%

Zinc Catalysts: Unlocking the Sustainable Transformation of Post-Consumer PET Waste through Chemical Recycling

MURUGAN,

VISWANATHAN,

RAVIKUMAR

et al. 2023

ajc

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This review article focuses on the reclamation of polyethylene terephthalate (PET) waste accomplished through zinc catalyzed depolymerization. Polyethylene terephthalate (PET) is a polyester that can be depolymerized in a variety of ways, including hydrolysis, alcoholysis, ammonolysis and aminolysis. Among these methods, widely employed methods are glycolysis and aminolysis due to their simplicity and adaptability in synthetic processes. The review explores the role of zinc catalysts in the PET depolymerization, with an emphasis on the latest advancements in this field. Zinc catalysts, known for their Lewis acidic nature, are capable of activating ester bonds using ionic liquids, nanoparticles, complexes, salts, porous materials and nanocomposites. Both homogeneous and heterogeneous zinc catalysts are discussed briefly in this comprehensive review.

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A Bird’s Eye View on Sustainable Management Solutions for Non-degradable Plastic Wastes

Cited by 8 publications

References 160 publications

Recent Advancements and Mechanism of Plastics Biodegradation Promoted by Bacteria: A Key for Sustainable Remediation for Plastic Wastes

Recent Advancements and Mechanism of Plastics Biodegradation Promoted by Bacteria: A Key for Sustainable Remediation for Plastic Wastes

Aminolytic Depolymerisation of Polyethylene Terephthalate Wastes using Sn doped ZnO Nanoparticles

Zinc Catalysts: Unlocking the Sustainable Transformation of Post-Consumer PET Waste through Chemical Recycling

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